Angenommene Manuskripte

 

Stand: 22. Oktober 2018

 

Fanck, M.: Der Förmitzspeicher, ein wichtiges Rastgewässer für Wasser- und Watvögel in Oberfranken

Der 1978 fertiggestellte Förmitzspeicher liegt am Rande des Fichtelgebirges im Landkreis Hof, Regierungsbezirk Oberfranken, Freistaat Bayern. Sein wasserwirtschaftlicher Zweck ist die Erhöhung der Durchflussmenge der nahegelegenen Sächsischen Saale in Zeiten niedriger Wasserstände. Der Seespiegel liegt bei Erreichen des Stauziels auf 529 bzw. 530 m ü. NN, die Wasserfläche beträgt insgesamt 126 ha, das Wasservolumen 14,5 Mio m3.

Von Anfang an war der Speicher für ziehende und rastende Wasservögel attraktiv, was durch Aufzeichnungen mehrerer Beobachter gut dokumentiert ist. Bisher wurden 242 Vogelarten festgestellt, davon werden 112 „wasser-affine“ Arten in einer teilweise kommentierten Artenliste hier behandelt.

Der Speicher liegt an den Endpunkten zweier großräumiger landschaftlicher „Leitlinien“: Erzgebirge/Fichtelgebirge und Thüringer Schiefergebirge/Frankenwald. Die Funktion dieser Linien für ziehende Vögel wird betrachtet.

Die bislang erschienenen Beiträge zur Avifauna Oberfrankens werden der anhaltend hohen Bedeutung des Förmitzspeichers nicht gerecht. Diese Arbeit versucht dem abzuhelfen.

 

Eingegangen am 12. September 2018

Angenommen nach Revision am 11. Oktober 2018

 

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Gansbühler, S.A., E. Obermaier & R. Pfeifer: Besiedlungsrelevante Lebensraumelemente des Baumpiepers Anthus trivialis in einem Muschelkalkgebiet in Nordbayern

The number of suitable nesting sites and the quality of breeding habitat in general are among the most important conditions for the colonization of an area by a bird species. Breeding habitat quality habitat significantly influences breeding success and the fitness of nestlings. Given the declining numbers of the species in Germany over many years, the aim of this study was to determine relevant habitat variables of the highly endangered Tree Pipit Anthus trivialis.

For this purpose a 440-ha study area, located 7 km northeast of the center of the town of Bayreuth, was examined. The area was mainly characterized by a semi-open landscape with lowland meadows, semi-arid grasslands, as well as by diverse hedgerows and field crops. In spring 2017 Tree Pipit

territories were mapped using the point-stop-method, and in summer 2017 a habitat analysis (33 habitat parameters) was carried out on 74 sample sites each with an area of 0.2 ha. The 74 sample sites consisted of 24 Tree Pipit territories that were recorded by the territory mapping in spring, and 50 random points for a statistically meaningful data basis.

The population density for the entire study area was 0.6 breeding pair territories/10 ha and for the NSG (FFH protected area) “Muschelkalkgebiet am Oschenberg” (323 ha) 0.8 territories/10 ha. The Tree Pipits had a significant preference for sites close to woodland edges (54 % at < 100 m from the edge of woodland) and for semi-open habitats (83 % of occurrence, population density of 0.96 territories/10 ha).

In addition, the calculation of a logistic regression model showed that the open areas created by paths, the number of potential song posts higher than one meter, and the structure of the herb layer (density and heterogeneity) had a significant positive influence on the occurrence of the species.

Therefore the bird depends on extensively managed open, not overgrown habitats with song posts. For the preservation of the species it is important to stop the progressive succession by appropriate conservation measures (e.g. grazing and removal of dense scrub).

 

Eingegangen am: 10. Juli 2018

Angenommen nach Revision am 19. Oktober 2018

 

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Flieger, B., D. Franz, G. Glätzer & U. Veit: Eine erfolgreiche Brut der Flussseeschwalbe Sterna hirundo im Oberen Maintal 2018 (Kurze Mitteilung)

 

Eingegangen am 4. Oktober 2018

Angenommen am 4. Oktober 2018

 

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Knief, U.: Wasseramseln Cinclus cinclus im nördlichen Landkreis Starnberg 2017/2018 (Kurze Mitteilung)

 

Eingegangen am 29. August 2018

Angenommen nach Revision am 17. Oktober 2018

 

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Brünner, K. & T. Rödl: Erfolgreiche Bestandsstützung beim Wendehals Jynx torquilla in den ostmittelfränkischen Sanden

Wryneck populations in Central Europe have dramatically declined since the mid 20th century and the species is listed as critically endangered on the current Bavarian Red List from 2016. The main causes are habitat destruction, overfertilization and pesticide use, and correspondingly a lack of the species’ main food source, ground-dwelling ants, as well as a lack of nest holes. An immediate solution to protect dwindling populations is the provisioning of artificial nestboxes, an approach that has been applied by local groups of the Landesbund für Vogelschutz [State association for bird protection] in the region of Mittelfranken (Middle Franconia), starting in 2015. Of 41 broods registered in nestboxes between 2016 and 2018, 78% were successful, i.e. with at least one young fledged. On average, 7.4 young birds fledged from successful broods, which had an average clutch size of 8.6. Compared with values in the literature and former studies some 50 years ago, breeding success, especially the rate of fledged young per clutch, was high in the study area. Nestbox design and size

are discussed as possible reasons. However the breeding success in this study relates to highly fragmented small patches of suitable habitat, which are unlikely to suffice in averting further decline of the population at large. Sustainable long-term protection of the Wryneck, which is a stenoecius (narrow-range) food specialist, will strongly depend on successful habitat protection and restoration.

Eingegangen am 30. August 2018

Angenommen am 5. September 2018